I don't mind if the new owners of Elf's pets trade.
It's up to THEM.
Not other people.
THEY choose to trade, they could use the new pet to aquire a new dream pet, but no, it's selfish. And rude. Apparently.
It's hard to keep one pet forever and ever, and some people trade, others don't.
Your entitled to your opinion, but what they do is up to them.
They do have a free will y'know.